Entropy Change Calculator — Formula
## Entropy Change
Entropy measures the disorder or unavailability of energy in a system.
### Formula
**DeltaS = Q / T**
for a reversible process at constant temperature. Positive DeltaS means entropy increases (heat absorbed). The second law states that total entropy of an isolated system never decreases.
Entropy measures the disorder or unavailability of energy in a system.
### Formula
**DeltaS = Q / T**
for a reversible process at constant temperature. Positive DeltaS means entropy increases (heat absorbed). The second law states that total entropy of an isolated system never decreases.
Esempio Risolto
1000 J of heat absorbed at 300 K.
- DeltaS = Q / T
- DeltaS = 1000 / 300
- DeltaS = 3.333 J/K